ScrollBar: Pixel tweak widget-less style
ScrollBar: Pixel tweak widget-less style

Up and left pointing arrows would look off-center.
Vertical handle would overlap 1px with top button, and miss 1px
to bottom button.

Change-Id: I6fe4ce96e62d864e9d6a7c835067e3c95f51bac4
Reviewed-by: Jens Bache-Wiig <9cea9d70b08f8210134ec5959114f72bad51ed1d@digia.com>

drgvond/qtquickcontrols,mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,kobolabs/qtquickcontrols,drgvond/qtquickcontrols,drgvond/qtquickcontrols,mizukusak/qtquickcontrols,mizukusak/qtquickcontrols,kobolabs/qtquickcontrols